- Harry: "When you say you’ve got the Cloak, and clothes . . ."
- Hermione: "Yes, they’re here."
- Ron: "How the ruddy hell – ?"
- Hermione: "Undetectable Extension Charm. Tricky, but I think I’ve done it okay; anyway, I managed to fit everything we need in here."
- — Hermione Granger explaining her use of the charm in 1997[src]
The Undetectable Extension Charm is a charm placed on any object to make the internal space larger than the external object appears.
Known and Possible Uses
Hermione Granger used this charm on her small beaded handbag in 1997 so that she was able to pack all the supplies she believed she would need while hunting down Lord Voldemort's Horcruxes with Harry Potter and Ron Weasley. This included books, changes of clothes, money, Harry's Cloak of Invisibility, and healing supplies.[1] Eventually, Hermione also placed the portrait of Phineas Nigellus Black that had previously been in 12 Grimmauld Place in her bag as well[2] to prevent Severus Snape from spying on them.
The same, or a similar, spell was used to make Ministry of Magic cars, tents at the Quidditch World Cup, and the Knight Bus larger on the inside.
Behind the scenes
- The effects of this spell is similar to the effects of a Bag of Holding in many role playing game scenarios and the TARDIS in Doctor Who.
Appearances
- Harry Potter and the Chamber of Secrets (possibly, in the form of Arthur Weasley's Flying Ford Anglia)
- Harry Potter and the Prisoner of Azkaban (possibly, in the form of the Knight Bus and the Ministry cars)
- Harry Potter and the Goblet of Fire (possibly, in the form of the tents at Quidditch World Cup)
- Harry Potter and the Goblet of Fire (film) (possibly, in the form of the tents at Quidditch World Cup)
- Harry Potter and the Deathly Hallows
Notes and references
- ↑ Harry Potter and the Deathly Hallows, Ch. 9
- ↑ Deathly Hallows, Ch. 12